That's great David. In humid areas a glue can take a few weeks to completely dry. As it dries, small polymer components are linking up to create long polymer chains.
If you rap on the board with a knuckle, you will hear a difference over the next few weeks.
This is true unless you use a specific damping compound. In that case, the benefit of dis-similar resonance (1/2" and 5/8") is gone, since the damping compound is directly addressing resonance. You would go for the mass = double 5/8" rock.
Oddly enough, if there's absorption in the cavity, you're OK. No need to fill the cavity. Per the data here :http://www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/ir/ir766/ir766.pdf Courtesy of the NRC in Canada
Also, you'll want to install insulation vertically for the reason you already described...
David. Have a look at this link. http://www.soundproofingcompany.com/library/articles/staggered_stud_wall_construction/
If posting links like this is frowned upon someone please let me know. Its a generic article.
I think you'll find that a damped system will increase TL from the fundamental LF resonance point all the way up to the coincidnce point. This can be seen on anyones TL plot.
You made the #1 biggest point of all. "If properly installed." Like anything else there are optimal conditions and also...
Since you're all involved with rooms generating a great deal of low frequency sound, I thought some here might find this topic interesting. Generally the most difficult aspect of high level sound isolation is controlling the low frequencies (bass). Keep in mind that STC doesn't measure bass, as...
Both systems employ Constrained Layer Damping (CLD). Both use two layers of mass, with a visco-elastic material applied in between. The panels flex, creating a shear force on the damping layer, which creates friction. This is the energy conversion to heat.
Have you looked on their website for...
I'd agree with the "advertising" comment if I were promoting a product. I am not. I also didn't introduce any link.
I'm quite familiar with the topic at hand. Quiet Rock, Supress, Comfort Guard and SoundBreak are all examples of factory damped drywall. Standard drywall or drywall/cement board...
That is not so.
Scenario #1 is simply adding mass to a system by applying drywall compound between layers of drywall. Heavier walls result, but not damped.
Scenario #2 is adding a damping compound between layers of mass for the purpose of damping that mass.
The effects / results oif simply...